CN209122138U - Dish-washing machine - Google Patents

Abstract

The utility model discloses a kind of dish-washing machine, which includes liner and jet pipe, wherein liner has multiple scrubbing sections, and each scrubbing section is correspondingly provided with a water system；Jet pipe is set in the scrubbing section, and the jet pipe is equipped with multiple spray orifices, and the jet pipe has water inlet end, and the water inlet end is connected to the water system.Since the dish-washing machine that the application proposes is equipped with more set water systems, therefore washing while different scrubbing sections can be realized of setting shunt valve is not needed, importantly, it is mutually indepedent between water system due to covering more, it can also realize the cleaning of varying strength in synchronization difference scrubbing section.

Description

Dish-washing machine

Technical field

The utility model relates to field of kitchen electric appliance, in particular to a kind of dish-washing machine.

Background technique

The course of work of dish-washing machine is: institute's wash up being put into dish-washing machine, chooses washing procedure, and press corresponding choosing Switch is selected, is powered on, cyclelog is started to work.After water reaches certain temperature, hole for water spraying through gushing arm sprays, gushing arm by The reaction force of water spray and rotate, constantly eject water on tableware, to reduce the viscosity and adhesive force of grease, and then will be dirty Object hydro-peening is clean.Existing dish-washing machine is provided only with a scrubbing section mostly, therefore existing dish-washing machine cannot achieve the same time Cleaning of the section in the varying strength of different washing zone.

Utility model content

The main purpose of the utility model is to propose a kind of dish-washing machine, it is intended to varying strength is realized in different scrubbing sections Cleaning.

To achieve the above object, the utility model proposes dish-washing machine include: liner, the liner have multiple washings Area, each scrubbing section are correspondingly provided with a water system；And jet pipe, it is set in the scrubbing section；It is set on the jet pipe There are multiple spray orifices, the jet pipe has water inlet end, and the water inlet end is connected to the water system.

Preferably, the liner includes multiple sinks in partition setting, is formed described in one in each sink Scrubbing section.

Preferably, the liner includes the first sink and the second sink, forms first in first sink and washes Area is washed, forms the second scrubbing section in second sink；The water system includes the first water system and second for water system System, first water system correspond to the first scrubbing section setting, and second water system corresponds to second scrubbing section Setting.

Preferably, mobilizable partition is equipped in the liner, the liner is divided into described first and washed by the partition Wash slot and second sink.

Preferably, the bottom wall of the liner corresponds to the partition and is convexly equipped with envelope wall, the bottom of the partition with it is described close Protection wall seals against.

Preferably, the water system includes sequentially connected water cup module, electric-motor pump and water supplying pipe, the water supplying pipe Water inlet end is connected to the electric-motor pump, and the water outlet of the water supplying pipe is connected to the jet pipe.

Preferably, pressure maintaining pipe, the diameter of the pressure maintaining pipe are communicated between the water outlet of the water supplying pipe and the jet pipe Greater than the diameter of the water supplying pipe.

Preferably, first water system includes sequentially connected first water softener, the first water cup module, first motor Pump, the first water supplying pipe and the first connection for being connected to first water softener, first water cup module and first motor pump Pipe；On the diagonal line for the bottom wall that first sink is arranged in the first motor pump and first water softener；And/or institute Stating the second water system includes sequentially connected second water softener, the second water cup module, the second electric-motor pump, the second water supplying pipe and company Lead to the second connecting tube of second water softener, second water cup module and second electric-motor pump；Second electric-motor pump It is arranged on the diagonal line of the bottom wall of second sink with second water softener.

Preferably, first water softener is extended to second water system side；And/or second electricity Pump is extended to first water system side.

Preferably, the dish-washing machine further includes driving device, and the jet pipe also has driving end；The driving device and institute The transmission connection of driving end is stated, the driving device is used to that the jet pipe to be driven to rotate around the axis of the jet pipe.

The dish-washing machine that the application proposes is equipped with more set water systems, therefore does not need setting shunt valve difference can be realized to wash Washing while washing area, it is often more important that, since different scrubbing sections is communicated with different water systems, cover water systems it Between it is mutually indepedent, therefore different water systems can be arranged to different backwash rates, so as to realize the same time In section, the cleaning of varying strength can be realized in different scrubbing sections.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.

Fig. 1 is the structural schematic diagram of one embodiment of the utility model dish-washing machine；

Fig. 2 is the structural schematic diagram of the water system of dish-washing machine；

Fig. 3 is the driving device of dish-washing machine and the decomposition texture schematic diagram of liner installation；

Fig. 4 is the partial enlarged view in Fig. 3 at A；

Fig. 5 is the schematic cross-sectional view of dish-washing machine；

Fig. 6 is the partial enlarged view in Fig. 5 at B；

Fig. 7 is the decomposition texture schematic diagram of driving device first embodiment；

Fig. 8 is the decomposition texture schematic diagram at another visual angle of driving device first embodiment；

Fig. 9 is the decomposition texture schematic diagram of driving device second embodiment.

Drawing reference numeral explanation:

Label	Title	Label	Title
				10	Liner	53	Second water supplying pipe
20	Jet pipe	100	Mounting shell
				30	Driving device	200	Transmission component
40	First water system	300	Driving motor
				50	Second water system	110	Front housing
60	Partition	120	Rear shell
				11	First sink	210	Driving gear
12	Second sink	220	Driven gear
				13	Envelope wall	111	Positioning column
14	First fixing piece	121	First connector
				15	Second fixing piece	122	Second connector
41	First water softener	221	First driven gear
				42	First motor pump	222	Second driven gear
43	First water supplying pipe	121a	Guide part
				51	Second water softener	221a	First limiting tooth
52	Second electric-motor pump	222a	Second limiting tooth

The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, fall within the protection scope of the utility model.

It is to be appreciated that if related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding, Afterwards ...), then directionality instruction is only used for explaining opposite between each component under a certain particular pose (as shown in the picture) Positional relationship, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.

In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve The combination of case is not present, also not within the protection scope of the requires of the utility model.

The utility model proposes a kind of dish-washing machine, which replaces gushing arm using jet pipe.

In an embodiment of the utility model, as shown in Figure 1, the dish-washing machine is water basin dish-washing machine, the water basin dish-washing machine is adjacent Nearly sink setting, specifically, water basin dish-washing machine can be integrally formed with sink, can also be detachably connected with sink.

Fig. 1 to Fig. 5 is please referred to, the dish-washing machine that the application proposes includes liner 10 and jet pipe 20, wherein the liner 10 has There are multiple scrubbing sections, each scrubbing section is correspondingly provided with a water system；Jet pipe 20 is set in the scrubbing section, the jet pipe 20 Multiple spray orifices are equipped with, the jet pipe 20 has water inlet end, and the water inlet end is connected to the water system.

Since the dish-washing machine that the application proposes is equipped with more set water systems, not needing setting shunt valve be can be realized not It is washed while with washing zone, it is often more important that, since different scrubbing sections is communicated with different water systems, more sets supply water It is mutually indepedent between system, therefore different water systems can be arranged to different backwash rates, it is same so as to realize In one period, the cleaning of varying strength can be realized in different washing zone, so, it is possible targetedly to clean turbid Different tablewares is spent, thus while guaranteeing that tableware can clean up, additionally it is possible to obtain water-saving effect.

Specifically, by taking two scrubbing sections, two sets of water systems as an example, wherein first set water passage system is configurable to Gao Shui Pressure, second set of water system are configurable to normal hydraulic pressure, in this way, can realize different washing effects in different scrubbing sections Fruit.For example, can be realized strength cleaning effect when first set water system is opened, second set of water system is closed；When first When covering water system closing, second set of water system unlatching, common cleaning effect can be realized；When first set water system, When two sets of water systems are opened simultaneously, strength cleaning and common cleaning can be achieved at the same time.

The design of right the application is without being limited thereto, in other embodiments, three, four or more washings can also be arranged Area, each scrubbing section configures a water system, in this way, different water systems can be configured to different cleaning strengths, To obtain more various cleaning effect.

Further, the dish-washing machine further includes driving device 30, and the jet pipe 20 also has driving end；The driving dress The 30 driving end transmission connections with the jet pipe 20 are set, the driving device 30 is for driving the jet pipe 20 around the jet pipe 20 Axis rotation.

Since the dish-washing machine that the application proposes replaces gushing arm using jet pipe 20, jet pipe 20 is rotated about axis to change jet angle Degree, to change flushing range, in this way, following both sides beneficial effect at least may be implemented.Firstly, jet pipe 20 it is small in size, It occupies little space, therefore water basin dish-washing machine has bigger accommodating space, further, since jet pipe 20 is rotatable around its axis, therefore 20 the space occupied of jet pipe is equal with its actual volume, therefore can guarantee that water basin dish-washing machine has biggish accommodating space.Its It is secondary, since jet pipe 20 is controlled by driving device 30, the rotational angle of jet pipe 20, which can be realized, to be accurately controlled, from And can accurately control the flushing angle of jet pipe 20 and rinse range, cleaning dead angle is avoided the occurrence of, enables tableware thorough It cleans.

In one embodiment of the application, the liner 10 includes multiple sinks in partition setting, each washing A scrubbing section is formed in slot.Specifically, in the present embodiment, liner 10 includes the first sink 11 and the in partition setting Two sinks 12, first sink 11 is interior to form the first scrubbing section, forms the second scrubbing section in second sink 12； The water system includes the first water system 40 and the second water system 50, first water system 40 corresponding described first Scrubbing section setting, the corresponding second scrubbing section setting of second water system 50.

Wherein, the first scrubbing section can be set to common scrubbing section, and the second scrubbing section can be set to heavy duty wash area, supply Water system is double water circuit systems, and the first water system 40 of double water circuit systems and the intensity of the second water system 50 are set in difference It sets, therefore strong and weak subregion can be realized in single wash, user is allowed targetedly to clean the different tableware of turbidity.

In addition, tableware passes sequentially through the different scrubbing section of intensity it is also possible that tableware realizes different degrees of cleaning, tool Body, tableware to be cleaned can be introduced into heavy duty wash area and be rinsed, and swill is rinsed well, enter back into common washing Area is rinsed, so that greasy dirt thoroughly be cleaned up.

The design of right the application is without being limited thereto, in other embodiments, first sink 11 and the second sink 12 It can also so, it is possible tableware in connection setting and be shifted from strength scrubbing section to common scrubbing section.

Further, referring to figure 3., in order to easily change liner 10 accommodating space volume, the application one In embodiment, the liner 10 is equipped with mobilizable partition 60, in this way, liner 10 can be separated into the first sink 11 and institute The second sink 12 is stated, when being equipped with partition 60, liner 10 can be divided into the first sink 11 and the second washing by partition 60 Slot 12, when removing partition 60, the first sink 11 is connected with the second sink 12, in this way, can be with accommodating body in liner 10 The bigger tableware of product, for example, cookware, large-scale plate etc..

Now the movable mounting structure of partition 60 specifically, in the present embodiment, set on the inner wall of the liner 10 There is the sliding slot vertically extended, the partition 60 is pullably mounted in the sliding slot.As a preferred method, every The top of plate 60 is equipped with attacker's slot, so, it is possible to facilitate pull partition 60.

Further, please continue to refer to Fig. 3, in order to improve the leakproofness of partition 60,60 leak of partition is avoided, the application one In embodiment, the bottom wall of the liner 10 corresponds to the partition 60 and is convexly equipped with envelope wall, the bottom of the partition 60 with it is described close Protection wall seals against.After envelope wall is set, the position of partition 60 can be raised, so as to reduce connecing for partition 60 and liner 10 Hydraulic pressure at seam, and then the leakproofness of partition 60 can be improved, avoid the water phase in the first sink 11 and the second sink 12 Mutually flowing.

The sealing coping is equipped with groove as a preferred method, and the bottom adaptation of the partition 60 is embedded at In the groove.In this way, the leakproofness of partition 60 can not only be further improved, additionally it is possible to improve partition 60 and liner 10 Bonding strength.

Further, now the mounting structure of the water system is illustrated.In the present embodiment, the partition 60 is set to The middle part of the liner 10, first water system 40 is set in the outside wall surface of the bottom wall of first sink 11, described Second water system 50 is set in the outside wall surface of the bottom wall of second sink 12, and first water system 40 and second Water system 50 is symmetrical set about the plane where partition.Since partition 60 is set to the middle part of liner 10, first is washed The structure for washing slot 11 and the second sink 12 is symmetrical, but the structure of the first water system 40 and the second water system 50 it is close, Weight is identical, therefore the first water system 40 is mounted on the wall surface of the first sink 11, the second water system 50 is mounted on On the wall surface of second sink 12, symmetrical configuration, the stabilization of dish-washing machine are enabled to.

Further, referring to figure 2., water system includes sequentially connected water cup module, electric-motor pump and water supplying pipe, described The water inlet end of water supplying pipe is connected to the electric-motor pump, and the water outlet of the water supplying pipe is connected to the jet pipe 20.In order to enable dish-washing machine Washing water softened, in one embodiment of the application, the water system further includes water softener.

As a preferred method, in order to enable the structure of dish-washing machine is more stable, in one embodiment of the application, the confession The water softener and electric-motor pump of water system are arranged on the diagonal line of washing groove bottom wall, and the water cup module of the water system is located at institute It states between water softener and electric-motor pump.

Preferably, pressure maintaining pipe, the diameter of the pressure maintaining pipe are communicated between the water outlet of the water supplying pipe and the jet pipe Greater than the diameter of the water supplying pipe, so, it is possible so that the hydraulic pressure of water supplying pipe is more steady.

Specifically, first water system 40 includes sequentially connected first water softener 41, the first water cup module, first Electric-motor pump 42, the first water supplying pipe 43 and be connected to first water softener 41, first water cup module and the first motor pump 42 the first connecting tube；The bottom wall of first sink 11 is arranged in the first motor pump 42 and first water softener 41 Diagonal line on；And/or

Second water system 50 includes sequentially connected second water softener 51, the second water cup module, the second electric-motor pump 52, the second water supplying pipe 53 be connected to the of second water softener 51, second water cup module and second electric-motor pump 52 Two connecting tubes；The diagonal of the bottom wall of second sink 12 is arranged in second electric-motor pump 52 and second water softener 51 On line.

Further, please referring now still to Fig. 2, in order to enable the arrangement of the first water system 40 and the second water system 50 is more Compact, in one embodiment of the application, first water system 40 and the second water system 50 are interspersed.Specifically, institute The first water softener 41 is stated to be extended to 50 side of the second water system；And/or second electric-motor pump 52 is to described One water system, 40 side is extended.

Referring to figure 3. to Fig. 8, now the driving device 30 of the dish-washing machine is illustrated, the effect of driving device 30 is Drive jet pipe 20 rotatable around its axis, the driving device 30 includes mounting shell 100, transmission component 200 and driving motor 300, Wherein, transmission component 200 is set in mounting shell 100, and driving motor 300 is set on mounting shell 100, the driving motor 300 Drive shaft is connected to the transmission component 200.

Firstly, since the dish-washing machine that the application proposes is equipped with driving device 30, which can drive jet pipe 20 Rotation, therefore it is capable of the flushing angle of active control gushing arm, cleaning dead angle is avoided the occurrence of, tableware is thoroughly cleaned.Its Secondary, since driving motor 300 is arranged on mounting shell 100, transmission component 200 is arranged in mounting shell 100, therefore can be realized The modularization of driving device 30, and then can be avoided the trouble for installing transmission component 200 and driving motor 300 respectively.Finally, mould The driving device 30 of block can be realized under different installation environments facilitates installation, therefore can be widely used in sink and wash On the products of types such as bowl machine, cabinet type dish washing machine, table dish-washer.

Further, in one embodiment of the application, the transmission component 200 is gear-driven assembly, and the gear passes Dynamic component 200 includes the driving gear 210 being connected with the driving motor 300 and is connected with the driving gear 210 driven Gear.

The driven gear includes that adaptation is engaged in the first of 210 two sides of driving gear as a preferred method, Driven gear 221 and the second driven gear 222, first driven gear 221 and second driven gear 222 symmetrically divide For cloth in the two sides of the driving gear 210, the jet pipe 20 includes the first jet pipe and the second jet pipe, first driven gear 221 connection first jet pipes, second driven gear 222 connect second jet pipe.Due to 221 He of the first driven gear Second driven gear 222 is symmetrically dispersed in the two sides of the driving gear 210, therefore enables to the first driven gear 221 With 222 smooth rotation of the second driven gear, it is often more important that, the first driven gear 221 and the second driven gear 222 symmetrically divide Cloth enables to the compact-sized of gear-driven assembly 200 in the two sides of the driving gear 210, to realize gear drive The miniaturization of component 200.

Further, as shown in Figure 7, it is contemplated that the rotation of jet pipe 20 has a certain range, in order to enable jet pipe 20 can It stops operating at the boundary for turning to preset range, in one embodiment of the application, first driven gear 221 is equipped with the One limiting tooth 221a, second driven gear 222 are equipped with the second limiting tooth 222a, the first limiting tooth 221a for limiting The extreme position that the driving gear 210 rotates counterclockwise is made, the second limiting tooth 222a is for limiting the driving gear 210 extreme positions rotated clockwise.

Further, Fig. 7 is please referred to, now the structure of the mounting shell 100 is described in detail.In the present embodiment, institute Stating mounting shell 100 includes the front housing 110 being detachably connected and rear shell 120, and the front housing 110 and the rear shell 120, which fasten, to be formed Installation cavity, the transmission component 200 are set in the installation cavity.

Specifically, 110 periphery of front housing is equipped at intervals with multiple first fixation holes, and it is fixed that 120 periphery of rear shell corresponds to multiple first Hole is equipped with multiple second fixation holes, after the first fixation hole is aligned with the second fixation hole, is removably connected by screw or rivet etc. Connect front housing 110 and rear shell 120.

Further, now the mounting structure of gear and mounting shell 100 is described in detail, the front housing 110 it is close Positioning column 111 is convexly equipped on the inner wall of the rear shell 120, it is described fixed that the driving gear 210 and the driven gear correspond to Position column 111 is equipped with mounting hole, the positioning column 111 and the mounting hole clearance fit, passes through pair of positioning column 111 and mounting hole Position cooperation, can conveniently realize the installation of driving gear 210 and driven gear.

The design of right this patent is without being limited thereto, and in other embodiments, transmission component 200 includes gear connecting rod transmission group Part, gear connecting rod transmission component 200 include driving motor 300, driving gear 210, connecting rod and the driven tooth being successively sequentially connected Wheel 220, wherein driven gear 220 includes the first driven gear 221 and the second driven gear 222；The jet pipe 20 includes first Jet pipe and the second jet pipe, first driven gear 221 connect first jet pipe, and second driven gear 222 connects institute State the second jet pipe.

Further, referring to figure 3. and Fig. 4, now to the mounting structure of the driving device 30 and internal cavity of bowl washer 10 into Row is described in detail.The outer wall of the liner 10 is equipped with multiple fixing pieces, and the mounting shell 100 is equipped with suitable with the fixing piece With fixed connector, the connector is adapted to fixation with the fixing piece.

Specifically, the fixing piece includes spaced first fixing piece 14 and the second fixing piece in a first direction 15, first fixing piece 14 and second fixing piece 15 are equipped at intervals with multiple in a second direction；The connector packet Include spaced first connector 121 in a first direction and the second connector 122, first connector 121 and described Second connector 122 is equipped at intervals with multiple in a second direction；The first direction and the second direction are perpendicular.Specifically Ground, in the present embodiment, the first direction is up and down direction, and the second direction is front-rear direction, due to fixing piece and connection Part in above-below direction be equipped at intervals with multiple on front-rear direction, therefore can guarantee steady after driving device 30 and liner 10 are installed Solidity.

As a preferred method, in one embodiment of the application, it is formed in a first direction on first fixing piece 14 The upper mounting groove in perforation setting；The guide part being extended along the first direction is convexly equipped on first connector 121 121a, the guide part 121a adaptation are inserted in the mounting groove, and there is positioning to make for the installation of guide part 121a and mounting groove With so, it is possible the installation for facilitating driving assembly and liner 10.

Specifically, now the installation process of driving assembly and liner 10 is described in detail.Firstly, guide part 121a is inserted Enter in mounting groove, installation after guide part 121a is installed in place with mounting groove, on the first fixing piece 14 and the first connector 121 Hole aligns, and the second fixing piece 15 aligns with the mounting hole on the second connector 122, at this point, being packed into screw in mounting hole Or driving assembly can be mounted on the outer wall of liner 10 by rivet.

The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model, It is all under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.

Claims (10)

1. a kind of dish-washing machine characterized by comprising

Liner, the liner have multiple scrubbing sections, and each scrubbing section is correspondingly provided with a water system；And

Jet pipe is set in the scrubbing section, and the jet pipe is equipped with multiple spray orifices, and the jet pipe has water inlet end, the water inlet End is connected to the water system.

2. dish-washing machine as described in claim 1, which is characterized in that the liner includes multiple sinks in partition setting, A scrubbing section is formed in each sink.

3. dish-washing machine as claimed in claim 2, which is characterized in that the liner includes the first sink and the second sink, The first scrubbing section is formed in first sink, forms the second scrubbing section in second sink；

The water system includes the first water system and the second water system, and first water system corresponds to described first and washes Area's setting is washed, second water system corresponds to the second scrubbing section setting.

4. dish-washing machine as claimed in claim 3, which is characterized in that be equipped with mobilizable partition, the partition in the liner The liner is divided into first sink and second sink.

5. dish-washing machine as claimed in claim 4, which is characterized in that the bottom wall of the liner corresponds to the partition and is convexly equipped with sealing Wall, the bottom of the partition are sealed against with the envelope wall.

6. the dish-washing machine as described in claim 1 to 5 any one, which is characterized in that the water system includes being sequentially connected with Water cup module, electric-motor pump and water supplying pipe, the water inlet end of the water supplying pipe is connected to the electric-motor pump, the water outlet of the water supplying pipe It is connected to the jet pipe.

7. dish-washing machine as claimed in claim 6, which is characterized in that be connected between the water outlet of the water supplying pipe and the jet pipe There is pressure maintaining pipe, the diameter of the pressure maintaining pipe is greater than the diameter of the water supplying pipe.

8. dish-washing machine as claimed in claim 3, which is characterized in that first water system includes sequentially connected first soft Hydrophone, first motor pump, the first water supplying pipe and is connected to first water softener, first water cup module at the first water cup module With the first connecting tube of first motor pump；The first motor pump and first water softener setting are in first washing On the diagonal line of the bottom wall of slot；And/or

Second water system includes sequentially connected second water softener, the second water cup module, the second electric-motor pump, the second water supply The second connecting tube managed and be connected to second water softener, second water cup module and second electric-motor pump；Described second On the diagonal line for the bottom wall that second sink is arranged in electric-motor pump and second water softener.

9. dish-washing machine as claimed in claim 8, which is characterized in that first water softener is to second water system side It is extended；And/or second electric-motor pump is extended to first water system side.

10. dish-washing machine as described in claim 1, which is characterized in that the dish-washing machine further includes driving device, and the jet pipe is also With driving end；The driving device and the driving end are sequentially connected, and the driving device is for driving the jet pipe around institute State the axis rotation of jet pipe.